I agree with guidenet here. It would be way better to get a further macro than a teleconverter. What you want from macro shots are sharpness and great IQ. The TCs would affect that.
Having said that, if you need the teleconverter, the Kenkos are great.
|Antz by Deadfisheye|
from Animated Film Title
|The Ladder - Fort Worth Museum of Modern Art by RJD13|
from Lookin' Up!